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2. What factors affect transport across a membrane

  • Temperature
  • Size of organism
  • Environment
  • Type of organism

3. What makes a good gas exchange surface?

  • Large surface area
  • Small concentration gradient
  • Small surface area
  • Thick walls

4. What is the gas exchange surface in mammals?

  • trachea
  • flight muscles
  • Alveolus
  • moist skin

5. Select a function of a enzyme

  • They catalyse reactions
  • they increase the products of a reaction.
  • they stop reactions
  • They are used to cure illnesses
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